Hetero-aggregation of fluidized nanoparticles and solid-containing aerosol droplets

流态化纳米颗粒和含固体气溶胶液滴的异质聚集

• 批准号: 462225760
• 负责人: Professor Dr.-Ing. Evangelos Tsotsas
• 金额: --
• 依托单位: Lehrstuhl für Thermische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/462225760?language=en
• 关键词: Hetero; aggregation; fluidized; nanoparticles; solid

The project aims at mixing in fluidized bed very small particles (nanoparticles or submicron particles) of different composition to hetero-agglomerates, which may additionally be encapsulated or coated with the help of aerosol droplets that contain embedding solid material. In this way, binary or ternary particulate composites of extremely finely dispersed constituents will be produced, aiming at new and superior properties. Instead of conventional fluidization, special spouted bed equipment with adjustable air inlet will be used for processing. High-velocity air inlet jets, which may be assisted by an immersed impactor and admixed large breaker particles, help to shift the highly dynamic equilibrium between aggregation and breakage towards smaller and stronger agglomerates in this kind of equipment. Submicron aerosol will be generated by a novel technique which is simple, robust and easily scalable. Regarding the characterization of agglomerates, new methods to reconstruct 3D agglomerate structure from 2D imaging data will be developed. In this frame, the level of sub-agglomerate mixing will be identified and pushed towards individual nanoparticles by use of non-flame, i.e. not sintered, raw material. Finally, the project will set ground for hierarchical discrete models that can describe process kinetics and agglomerate formation even with very large number of primary particles. In SPP 2289, methodic cooperation and technical complementarity is seen with, especially, projects on crossing flames, high shear mixing, assisted fluidization, and imaging.

该项目旨在将不同成分的非常小的颗粒（纳米颗粒或亚微米颗粒）在流化床中混合成异质团块，这些异质团块可能还会在含有嵌入固体物质的气溶胶液滴的帮助下被包裹或涂覆。通过这种方式，将产生具有极细分散成分的二元或三元颗粒复合材料，旨在获得新的和优越的性能。代替传统的流化，特殊的喷淋床设备，可调节的进风口将用于处理。高速进气射流可以由浸入式冲击器和混合的大破碎颗粒辅助，有助于将这种设备中团聚和破碎之间的高度动态平衡转向更小、更强的团聚。亚微米气溶胶将由一种简单、可靠且易于扩展的新技术产生。针对团块的表征，将开发利用二维成像数据重建三维团块结构的新方法。在这个框架中，亚团块混合的水平将被确定，并通过使用非火焰，即未烧结的原料，将其推向单个纳米颗粒。最后，该项目将为分层离散模型奠定基础，该模型可以描述过程动力学和团块形成，即使有大量的初级颗粒。在SPP 2289中，在交叉火焰、高剪切混合、辅助流化和成像等项目中，可以看到有条不紊的合作和技术互补。